Definitions:

1. ambiguous, especially preceded by a negative adjective
   • The judge spoke in no uncertain terms to the defendant.
2. lacking or indicating lack of confidence or assurance adjective
   • They were uncertain of their convictions.
3. not consistent or dependable adjective
   • an uncertain recollection of events

Synonyms:

• changeable
• fluid
• incertain
• unsealed
• unsettled
• unstable
• unsure

NearBy Words:

• uncertainly
• uncertainness
• uncertainty